diff --git a/modules/mesh-delivery-gate/cmd/mesh-delivery-gate/adr505_bus_test.go b/modules/mesh-delivery-gate/cmd/mesh-delivery-gate/adr505_bus_test.go
new file mode 100644
index 00000000..0bde5945
--- /dev/null
+++ b/modules/mesh-delivery-gate/cmd/mesh-delivery-gate/adr505_bus_test.go
@@ -0,0 +1,88 @@
+//go:build integration
+
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"strconv"
+	"strings"
+	"testing"
+	"time"
+
+	sdk "git.novox.be/novox/mesh-sdk/go/delivery"
+)
+
+// novox/hq ADR 0505 §4 over the real bus, in the bed of bus_test.go: the gate whole, its deliveries kept in its buckets.
+
+// call asks the bundle one of its verbs, as the runtime does, and answers its result's text.
+func (r *runtime) call(t *testing.T, name string, args map[string]any) string {
+	t.Helper()
+	r.mu.Lock()
+	r.next++
+	id := "adr505-" + strconv.Itoa(r.next)
+	ch := make(chan json.RawMessage, 1)
+	r.wait[id] = ch
+	r.mu.Unlock()
+	r.say(map[string]any{"id": id, "method": "tools/call", "params": map[string]any{"name": name, "arguments": args}})
+	select {
+	case raw := <-ch:
+		return string(raw)
+	case <-time.After(30 * time.Second):
+		t.Fatalf("%s was not answered in 30 s", name)
+	}
+	return ""
+}
+
+// ADR 0505 §4: an approved head the merge tool refused because its trunk moved is shown by `show` at once but is not in
+// `stalled` while its fresh check is unanswered; once that check passed and the merge is refused again, it is.
+func TestATrunkMovedRefusalIsStalledOnlyOnceItsFreshCheckDidNotCureItOverARealBus(t *testing.T) {
+	b := newTestBus(t)
+	ctx := context.Background()
+	rt := b.start(t)
+	evctx, cancel := context.WithCancel(ctx)
+	defer cancel()
+	rt.deliverEvents(evctx)
+	rt.until("the module to subscribe to the events it follows", 20*time.Second, func() bool {
+		rt.mu.Lock()
+		defer rt.mu.Unlock()
+		return len(rt.subs) >= len(followed)
+	})
+	rt.untilHolding()
+
+	const head = "1111111111111111111111111111111111111111"
+	id := IDOf("novox/app", head)
+	announced := pr("novox/app", 7, head, "fix/x", "src/a.go")
+	announced.BaseSHA = "t1t1t1t1t1t1"
+	b.publish(t, "mesh.mod.gitea.event.pull.updated", announced)
+	b.publish(t, "mesh.seat."+ControllerSeat+".event.checked", judgedAt("novox/app", 7, head, "pass", "t1t1t1t1t1t1"))
+	var key string
+	rt.until("the ask to be written", 10*time.Second, func() bool { key = onlyAsk(b); return key != "" })
+	b.answer(t, key, OptionApprove)
+	rt.until("the merge to be handed to the bridge", 10*time.Second, func() bool { return len(mergeAt(b, "fix/x").Pulls) > 0 })
+
+	refused := func() {
+		b.forgeSays(t, sdk.Forge{Kind: sdk.ForgeRefused, Act: "merge", Repository: "novox/app", Number: 7, Head: head,
+			Words: errAskedAgain.Error()})
+	}
+	refused()
+	rt.until("show to name the refusal at once", 10*time.Second, func() bool {
+		return strings.Contains(rt.call(t, Seat+".show", map[string]any{"id": id}), "its verdict was judged against trunk")
+	})
+	if got := rt.call(t, Seat+".stalled", map[string]any{}); strings.Contains(got, id) {
+		t.Fatalf("said as stalled while its fresh check runs: %s", got)
+	}
+
+	// The trunk moved; the head is announced again and its fresh check passes; the merge is refused again on it.
+	b.publish(t, "mesh.mod.gitea.event.pull.merged", merged("novox/app", 9, "9999999999999999999999999999999999999999", "t2t2t2t2t2t2"))
+	b.publish(t, "mesh.mod.gitea.event.pull.updated", announced)
+	time.Sleep(time.Second)
+	b.publish(t, "mesh.seat."+ControllerSeat+".event.checked", judgedAt("novox/app", 7, head, "pass", "t2t2t2t2t2t2"))
+	rt.until("the fresh verdict to be heard", 10*time.Second, func() bool {
+		return strings.Contains(rt.call(t, Seat+".show", map[string]any{"id": id}), "t2t2t2t2t2t2")
+	})
+	refused()
+	rt.until("the refusal on the fresh verdict to be said as stalled", 10*time.Second, func() bool {
+		return strings.Contains(rt.call(t, Seat+".stalled", map[string]any{}), id)
+	})
+}